§ 9. The growth of numerous and strongly-built structural attachments between different trades and markets related to different localities implies the existence of a large system of channels of communication throughout our industrial society. By the increased number and complexity of these channels connecting different markets and businesses, and relating the most distant classes of consumers, we can measure the evolution of the industrial organism. Through these channels flow the currents of modern industrial life, whose pace, length, and regularity contrast with the feeble, short, and spasmodic flow of commerce in earlier times. This advance in functional activity of distribution is thus expressed by Mr. Spencer:--"In early English times the great fairs, annual and other, formed the chief means of distribution, and remained important down to the seventeenth century, when not only villages, but even small towns, devoid of shops, were irregularly supplied by hawkers who had obtained their stocks at these gatherings. Along with increased population, larger industrial centres, and improved channels of communication, local supply became easier; and so frequent markets more and more fulfilled the purpose of infrequent fairs. Afterwards, in chief places and for chief commodities, markets themselves multiplied, becoming in some cases daily. Finally came a constant distribution, such that of some foods there is to each town an influx every morning; and of milk even more than once in the day. The transition from times when the movements of people and goods between places were private, slow, and infrequent, to times when there began to run at intervals of several days public vehicles moving at four miles an hour, and then to times when these shortened their intervals and increased their speed, while their lines of movement multiplied, ending in our own times, when along each line of rails there go at full speed a dozen waves daily that are relatively vast, sufficiently show us how the social circulation progresses from feeble, slow, irregular movements to a rapid, regular, and powerful pulse."[116]
The differentiation of function in the several parts of the industrial organism finds a partial expression in the localisation of certain industries. As there is growing division of labour among individuals and groups of individuals, so the expansion of the area of competition has brought about a larger and larger amount of local specialisation.